package com.atguigu.lease.web.admin.service.impl;

import com.atguigu.lease.common.minio.MinioProperties;
import com.atguigu.lease.web.admin.service.FileService;
import io.minio.*;
import io.minio.errors.*;
import org.apache.commons.lang3.time.DateFormatUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;

@Service
public class FileServiceImpl implements FileService {
    @Autowired
    private MinioProperties minioProperties;
    @Autowired
    private MinioClient minioClient;

    @Override
    public String upload(MultipartFile file) throws ServerException, InsufficientDataException, ErrorResponseException, IOException, NoSuchAlgorithmException, InvalidKeyException, InvalidResponseException, XmlParserException, InternalException {

        boolean bucketExists = minioClient.bucketExists(BucketExistsArgs.builder().bucket(minioProperties.getBucketName()).build());
        if (!bucketExists) {
            minioClient.makeBucket(MakeBucketArgs.builder().bucket(minioProperties.getBucketName()).build());
            //设置hello-minio桶的访问权限  test
            minioClient.setBucketPolicy(SetBucketPolicyArgs.builder().
                    bucket(minioProperties.getBucketName()).
                    config(createBucketPolicyConfig(minioProperties.getBucketName())).build());
        } else {
            System.out.println("Bucket '"+minioProperties.getBucketName()+"' already exists.");
        }
        String fileName = DateFormatUtils.format(new Date(),"yyyy/MM/dd") + "/"
                + UUID.randomUUID().toString().replaceAll("-","") + "_" + file.getOriginalFilename();
        minioClient.putObject(PutObjectArgs.builder()
                .bucket(minioProperties.getBucketName())
                .object(fileName)
                .stream(file.getInputStream(), file.getSize(), -1)
                .contentType(file.getContentType())
                .build());
        return String.join("/", minioProperties.getEndpoint(),
                minioProperties.getBucketName(), fileName);
    }

    /*上述createBucketPolicyConfig方法的作用是生成用于描述指定bucket访问权限的JSON字符串。
    最终生成的字符串格式如下，其表示，允许(Allow)所有人(*)获取(s3:GetObject)
    指定桶(<bucket-name>)的内容。*/
    private String createBucketPolicyConfig(String bucketName) {
        return """
                {
                  "Statement" : [ {
                    "Action" : "s3:GetObject",
                    "Effect" : "Allow",
                    "Principal" : "*",
                    "Resource" : "arn:aws:s3:::%s/*"
                  } ],
                  "Version" : "2012-10-17"
                }""".formatted(bucketName);
    }
}
